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Page 34 Installation and Operation English
Troubleshooting pro.Bose.com
Troubleshooting
Problem Solution
No power • Turn on power� Blue LED on front-panel will be visible when power is on�
• Make sure the power cord is plugged in�
• Try a different AC outlet that is working with another piece of equipment�
Power is on, but no sound • Make sure the input source is turned on�
• Verify that there is an input signal from the source�
• Check the cable connections from the source to the amplifier�
• Ensure the desired source (A/B) is selected on the front panel�
• If a user interface is connected to the Remote connector on the rear panel, make
sure the desired source (A/B) is selected on user interface (user interface overrides
the front-panel source select)�
• Make sure the Master Level control is turned up�
• If a user interface is connected to the Remote connector on the rear panel, make
sure the volume control on the user interface is turned up (user interface overrides
the front-panel Master Level control)�
• Make sure a 1/8" (3�5 mm) TRS input cable is not connected to the Aux Input�
The Aux Input has a mechanical override feature so if an input cable is connected
to it the selected Input A/B source will be automatically overridden - even if the Aux
Input audio source is not playing or connected�
• If a contact closure is connected to the Mute connector on the rear panel, check the
switch to ensure the mute function has not been triggered�
• If a source is connected to the Page connector on the rear panel, make sure it has
not been triggered�
• Make sure loudspeakers are connected properly�
• Check that loudspeaker taps are set correctly�
• Check that the amplifier has adequate ventilation� Improper ventilation could cause
the amplifier to go into protection mode and no audio will be heard�
• Ensure that the output wiring is correct� A short circuit will cause the amplifier to go
into protection mode and no audio will be heard�
Power is on, but sound is low • Verify that the audio input source output is turned up to a nominal level�
• Check the cable connections from the source to the amplifier�
• Increase input level of source with Gain controls on amplifier� Turn Gain knob up until
you start seeing red Input Clip LED on front-panel� Then turn Gain down until red
LED Input Clip does not engage�
• Make sure Output Trim controls on amplifier are not turned down too much�
• If a user interface is connected to the Remote connector on the rear panel, make
sure the volume control on the user interface is turned up (user interface overrides
the front-panel Master Level control)�
Sound is distorted • Verify that the Input Clip red LED on the front-panel is not lit� If LED is red, reduce
the source output level or reduce the input gain�
• If the input source signal is clean, verify that the loudspeakers are not overdriven or
damaged� Check the loudspeaker tap setting�
Unnatural sound • Verify that the proper EQ preset is selected for the loudspeakers being used� Use
HPF (IZA 190-HZ) or FLAT (IZA 250-LZ) setting when using loudspeakers other than
FreeSpace
®
FS2C/SE/P or FS4CE/SE loudspeakers�
• Check the Treble and Bass controls on the front-panels�
• Verify that the loudspeakers are wired correctly (+ to + and - to -)�
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